Journal of thermal biology最新文献

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Native versus non-native ascidians in the Adriatic Sea: Species-specific patterns in behavior and HSP70 response during heat stress 亚得里亚海的本土与非本土腹足类:热应激期间行为和 HSP70 响应的物种特异性模式。
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103928
{"title":"Native versus non-native ascidians in the Adriatic Sea: Species-specific patterns in behavior and HSP70 response during heat stress","authors":"","doi":"10.1016/j.jtherbio.2024.103928","DOIUrl":"10.1016/j.jtherbio.2024.103928","url":null,"abstract":"","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0306456524001463/pdfft?md5=235442cdbde5fc5238fd359465dd816f&pid=1-s2.0-S0306456524001463-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141913102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Testing metabolic cold adaptation and the climatic variability hypothesis in two latitudinally distant populations of a supratidal water beetle 在两个纬度相距甚远的潮上带水甲虫种群中测试新陈代谢的寒冷适应性和气候变异假说。
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103934
{"title":"Testing metabolic cold adaptation and the climatic variability hypothesis in two latitudinally distant populations of a supratidal water beetle","authors":"","doi":"10.1016/j.jtherbio.2024.103934","DOIUrl":"10.1016/j.jtherbio.2024.103934","url":null,"abstract":"<div><p>Temperature significantly impacts ectotherm physiology, with thermal tolerance and metabolic traits typically varying with latitude across species ranges. The drivers of this variation remain unclear, however, despite obvious consequences for population persistence and conservation in the face of ongoing global change. This study explored local adaptation and phenotypic plasticity of metabolic rates and thermal limits in the supratidal rockpool beetle <em>Ochthebius lejolisii</em>. Using populations from localities at different ends of the species range that experience contrasting thermal variability, we simultaneously tested two of the major paradigms of spatial physiological ecology: metabolic cold adaptation (MCA) and the climatic variability hypothesis (CVH). Reciprocal acclimation was conducted under spring temperature regimes of both localities, incorporating local diurnal variation. Metabolic rates were measured by closed respirometry, and thermal tolerance limits estimated through thermography. In line with MCA, the higher-latitude population (colder climate) showed higher metabolic rates and temperature coefficients (Q<sub>10</sub>s) at lower temperatures than the lower-latitude population. As predicted by the CVH, the lower-latitude population (more variable climate) showed higher upper thermal tolerance but only the higher-latitude population was able to acclimate upper thermal limits. This result suggests trade-offs between physiological thermal limits and thermal plasticity in this species. A limited acclimation capacity could make populations on Mediterranean coasts especially vulnerable in the face of projected increases in extreme temperatures under ongoing climate change.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0306456524001529/pdfft?md5=05e4b0af4b7938197c4b1c0743492ce0&pid=1-s2.0-S0306456524001529-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141902121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hot, dry, and salty: The present and future of an Extremophile model lizard from Argentina 热、干、咸:阿根廷嗜极模式蜥蜴的现状与未来。
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103917
Rafael A. Lara-Reséndiz , José M. Sánchez , Romina S. Paez , Suelem Muñiz-Leão , Guarino R. Colli , Donald B. Miles , Barry Sinervo , Nicolás Pelegrin
{"title":"Hot, dry, and salty: The present and future of an Extremophile model lizard from Argentina","authors":"Rafael A. Lara-Reséndiz ,&nbsp;José M. Sánchez ,&nbsp;Romina S. Paez ,&nbsp;Suelem Muñiz-Leão ,&nbsp;Guarino R. Colli ,&nbsp;Donald B. Miles ,&nbsp;Barry Sinervo ,&nbsp;Nicolás Pelegrin","doi":"10.1016/j.jtherbio.2024.103917","DOIUrl":"10.1016/j.jtherbio.2024.103917","url":null,"abstract":"<div><p>Global warming poses a threat to lizard populations by raising ambient temperatures above historical norms and reducing thermoregulation opportunities. Whereas the reptile fauna of desert systems is relatively well studied, the lizard fauna of saline environments has not received much attention and—to our knowledge—thermal ecology and the effects of global warming on lizards from saline environments have not been yet addressed. This pioneer study investigates the thermal ecology, locomotor performance and potential effects of climate warming on <em>Liolaemus ditadai</em>, a lizard endemic to one of the largest salt flats on Earth. We sampled L. <em>ditadai</em> using traps and active searches along its known distribution, as well as in other areas within Salinas Grandes and Salinas de Ambargasta, where the species had not been previously recorded. Using ensemble models (GAM, MARS, RandomForest), we modeled climatically suitable habitats for <em>L. ditadai</em> in the present and under a pessimistic future scenario (SSP585, 2070). <em>L. ditadai</em> emerges as an efficient thermoregulator, tolerating temperatures near its upper thermal limits. Our ecophysiological model suggests that available activity hours predict its distribution, and the projected temperature increase due to global climate change should minimally impact its persistence or may even have a positive effect on suitable thermal habitat. However, this theoretical increase in habitat could be linked to the distribution of halophilous scrub in the future. Our surveys reveal widespread distribution along the borders of Salinas Grandes and Salinas de Ambargasta, suggesting a potential presence along the entire border of both salt plains wherever halophytic vegetation exists. Optimistic model results, extended distribution, and no evidence of flood-related adverse effects offer insights into assessing the conservation status of <em>L. ditadai</em>, making it and the Salinas Grandes system suitable models for studying lizard ecophysiology in largely unknown saline environments.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141590638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unravelling the impact of heat stress on daughter pregnancy rate in Mehsana buffalo through innovative breeding interventions 通过创新育种干预措施揭示热应激对 Mehsana 水牛女儿怀孕率的影响
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103922
{"title":"Unravelling the impact of heat stress on daughter pregnancy rate in Mehsana buffalo through innovative breeding interventions","authors":"","doi":"10.1016/j.jtherbio.2024.103922","DOIUrl":"10.1016/j.jtherbio.2024.103922","url":null,"abstract":"<div><p>Heat stress profoundly affects the reproductive success of buffaloes, which are vital for the dairy industry due to their unique anatomical and physiological characteristics, necessitating careful evaluation under such conditions. Hence, this guided our search for quantifying heat stress' impact on Mehsana buffaloes using the best THI model and evaluating sires’ performance. Fertility records (days open converted to daughter pregnancy rate) were collected in the span of over 24 years, w.e.f. 1989 to 2012. Finally, 3070 records of first lactation cows, daughters of 117 sires from DURDA, Gujarat, India, were used in the analysis. Meteorological data were retrieved from IMD, Pune, to understand the relationship between daughter pregnancy rate (DPR) and heat stress indicators. Several heat stress models were compared based on R<sup>2</sup>, adjusted R<sup>2</sup>, AIC, and BIC values, and the impact of heat stress was quantified. The year was classified into different heat stress zones, viz., Non heat stress zone (NHSZ), Heat stress zone (HSZ), and critical heat stress zone (CHSZ), drawing from the findings of DPR and THI. The THI 4th model based on dry and wet bulb temperature was identified as the best-fit model, and DPR significantly changed (P &lt; 0.01) by 1.14% per unit change in THI value based on the month of calving. The average EBVs of the sires for DPR were found to be 20.78% (NHSZ), 38.09% (HSZ), and 39.08% (CHSZ) using BLUP-SM and 20.78% (NHSZ), 37.30% (HSZ), and 38.87% (HSZ) using BLUP-AM. Subsequently, the optimum sire for each of the zones was prioritized. It is noteworthy that bulls that performed better in NHSZ did not perform as well in HSZ and CHSZ, and vice versa. This supports the possibility of evaluating bulls independently in each heat stress zone.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141701096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of combined treatment with hydrogen-rich electrolyzed water and tea polyphenols on oxidative stress, intestinal injury and intestinal flora disruption in heat-stressed mice 富氢电解水和茶多酚联合处理对热应激小鼠氧化应激、肠道损伤和肠道菌群失调的影响
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103921
{"title":"Effects of combined treatment with hydrogen-rich electrolyzed water and tea polyphenols on oxidative stress, intestinal injury and intestinal flora disruption in heat-stressed mice","authors":"","doi":"10.1016/j.jtherbio.2024.103921","DOIUrl":"10.1016/j.jtherbio.2024.103921","url":null,"abstract":"<div><p>Heat stress (HS) can cause damage to the organism, especially the intestinal tract. In this paper, we investigated the effects of the combined action of tea polyphenols (TP) and hydrogen-rich electrolyzed water (HRW) on HS in mice. The combination of HRW feeding and TP of intraperitoneal injection was screened by in vitro antioxidant activity assay. The results revealed that the combined treatment was more helpful in alleviating the effects of HS on the behavior, growth performance, oxidative damage, and intestinal tract of mice compared with the respective treatments of TP and HRW (P &lt; 0.05). Additionally, the combined treatment could repair HS-induced intestinal dysbiosis in mice, augmenting the number and abundance of bacteria, increasing the number of beneficial genera (<em>Lachnospiraceae_NK4A136_group and Lactobacillus</em>), and decreasing the number of harmful genera (<em>Desulfovibrio</em> and <em>Enterorhabdus</em>), and the effect was significantly better than that of individual treatment (P &lt; 0.05). In conclusion, the combined treatment of TP and HRW effectively mitigates the adverse effects of HS on mouse behavior, growth performance, oxidative damage, and intestinal dysbiosis, surpassing the efficacy of individual treatments with TP or HRW alone.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141732226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of dietary curcumin nano-micelles on performance, biological responses, and thermal stress resilience in heat-stressed fattening lambs across varying temperature-humidity index conditions: Implications for climate change 日粮姜黄素纳米微粒对不同温湿度指数条件下热应激育肥羔羊的性能、生物反应和热应激复原力的影响:对气候变化的影响。
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103905
Mostafa Bokharaeian, Abdolhakim Toghdory, Taghi Ghoorchi
{"title":"Effects of dietary curcumin nano-micelles on performance, biological responses, and thermal stress resilience in heat-stressed fattening lambs across varying temperature-humidity index conditions: Implications for climate change","authors":"Mostafa Bokharaeian,&nbsp;Abdolhakim Toghdory,&nbsp;Taghi Ghoorchi","doi":"10.1016/j.jtherbio.2024.103905","DOIUrl":"10.1016/j.jtherbio.2024.103905","url":null,"abstract":"<div><p>Heat stress poses a significant challenge to sheep farming in arid and semi-arid regions, impacting growth performance, health, and physiological responses. While sheep have innate mechanisms to manage heat stress, prolonged exposure impairs their performance and health. This study evaluated the influence of varying doses of Curcumin Nano-Micelle (CNM) on heat-stressed fattening lambs in northeastern Iran over three months, examining the relationship between CNM doses and growth performance, feeding behavior, physiological responses, immune function, and antioxidant status. Thirty-two crossbred male lambs were included in a completely randomized design with four treatments and eight replications. The experimental treatments were as follows: 1) CTRL: No dietary inclusion of CNM, (control group); 2) T20: Dietary inclusion of 20 mg of CNM per head per day; 3) T40: Dietary inclusion of 40 mg of CNM per head per day; and 4) T80: Dietary inclusion of 80 mg of CNM per head per day. The results revealed that dietary supplementation with 20 and 40 mg of CNM significantly improved live body weight, weight gain, average daily gain (ADG), and feed conversion ratio (FCR) compared to the control treatment. Regression analysis demonstrated quadratic models between growth performance parameters and the Temperature-Humidity Index (THI), indicating a correlation between CNM doses and the animals' responses to heat stress. Regarding eating behavior, CNM doses of 40 and 80 mg/day significantly reduced eating time while increasing ruminating time. Blood analysis indicated significant reductions in glucose levels across all treatments, with T40 significantly reducing both cholesterol and triglyceride (TG) levels. Additionally, CNM supplementation decreased serum malondialdehyde (MDA) levels and increased superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities, indicating enhanced antioxidant status. Physiological responses were influenced by CNM, notably reducing rectal temperature (RT), skin temperature (ST), respiration rate (RR), while pulse rate (PR) increased across various time intervals, particularly in the T80 group. This study demonstrates that CNM supplementation can enhance performance, physiological responses, and antioxidant status in heat-stressed fattening lambs, highlighting its potential to mitigate heat stress effects in sheep farming.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141469047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phenotypic plasticity and thermal efficiency of temperature responses in two conspecific springtail populations from contrasting climates 两个气候截然不同的同种春尾种群的表型可塑性和温度反应的热效率。
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103914
Sagnik Sengupta , Hans Petter Leinaas
{"title":"Phenotypic plasticity and thermal efficiency of temperature responses in two conspecific springtail populations from contrasting climates","authors":"Sagnik Sengupta ,&nbsp;Hans Petter Leinaas","doi":"10.1016/j.jtherbio.2024.103914","DOIUrl":"10.1016/j.jtherbio.2024.103914","url":null,"abstract":"<div><p>Temperature drives adaptation in life-history traits through direct effects on physiological processes. However, multiple life-history traits co-evolve as a life-history strategy. Therefore, physiological limitations constraining the evolution of trait means and phenotypic plasticity can be larger for some traits than the others. Comparisons of thermal responses across life-history traits can improve our understanding of the mechanisms determining the life-history strategies. In the present study, we focused on a soil microarthropod species abundant across the Northern Hemisphere, <em>Folsomia quadrioculata</em> (Collembola), with previously known effects of macroclimate. We selected an arctic and a temperate population from areas with highly contrasting climates — the arctic tundra and a coniferous forest floor, respectively — and compared them for thermal plasticity and thermal efficiency in growth, development, fecundity, and survival across four temperatures for a major part of their life cycle. We intended to understand the mechanisms by which temperature drives the evolution of life-history strategies. We found that the temperate population maximized performance at 10–15 °C, whereas the arctic population maintained its thermal efficiency across a wider temperature range (10–20 °C). Thermal plasticity varied in a trait-specific manner, and when considered together with differences in thermal efficiency, indicated that stochasticity in temperature conditions may be important in shaping the life-history strategies. Our study suggests that adopting a whole-organism approach and including physiological time considerations while analysing thermal adaptation will markedly improve our understanding of plausible links between thermal adaptation and responses to global climate change.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0306456524001323/pdfft?md5=fa1975a05fd0ff355d2eee7fad55f864&pid=1-s2.0-S0306456524001323-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141563635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Machine learning thermal comfort prediction models based on occupant demographic characteristics 基于居住者人口特征的机器学习热舒适度预测模型
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103884
Ezgi Kocaman , Merve Kuru Erdem , Gulben Calis
{"title":"Machine learning thermal comfort prediction models based on occupant demographic characteristics","authors":"Ezgi Kocaman ,&nbsp;Merve Kuru Erdem ,&nbsp;Gulben Calis","doi":"10.1016/j.jtherbio.2024.103884","DOIUrl":"10.1016/j.jtherbio.2024.103884","url":null,"abstract":"<div><p>This study aims to investigate the predictive occupant demographic characteristics of thermal sensation (TS) and thermal satisfaction (TSa) as well as to find the most effective machine learning (ML) algorithms for predicting TS and TSa. To achieve this, a survey campaign was carried out in three mixed-mode buildings to develop TS and TSa prediction models by using six ML algorithms (Logistic Regression, Naïve Bayes, Decision Tree (DT), Random Forest (RF), K-Nearest Neighborhood (KNN) and Support Vector Machine). The prediction models were developed based on six demographic characteristics (gender, age, thermal history, education level, income, occupation). The results show that gender, age, and thermal history are significant predictors of both TS and TSa. Education level, income, and occupation were not significant predictors of TS, but were significant predictors of TSa. The study also found that RF and KNN are the most effective ML algorithms for predicting TS, while DT and RF are the most effective ML algorithms for predicting TSa. The study found that the accuracy of TS prediction models ranges from 83% to 99%, with neutral being the most correctly classified scale. The accuracy of TSa prediction models ranges from 84% to 97%, with dissatisfaction being the most common misclassification.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141398640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effects of cold water immersion and partial body cryotherapy on subsequent exercise performance and thermoregulatory responses in hot conditions 冷水浸泡和部分身体冷冻疗法对高温条件下后续运动表现和体温调节反应的影响。
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103926
{"title":"The effects of cold water immersion and partial body cryotherapy on subsequent exercise performance and thermoregulatory responses in hot conditions","authors":"","doi":"10.1016/j.jtherbio.2024.103926","DOIUrl":"10.1016/j.jtherbio.2024.103926","url":null,"abstract":"<div><p>This study investigated the effects of cold water immersion (CWI) and partial body cryotherapy (PBC) applied within a 15-min post-exercise recovery period on thermoregulatory responses, subjective perceptions, and exercise performance under hot conditions (39 °C). Twelve male soccer players participated in team-sports-specific assessments, including Agility T-test (T-test), 20-m sprint test (20M-ST), and Yo-Yo Intermittent Endurance Test Level 1 (YY-T), during two exercise bouts (1<sup>st</sup> bout and 2<sup>nd</sup> bout) with a 15-min post-exercise recovery period. Within the recovery period, a 3-min of PBC at −110 °C or CWI at 15 °C or a seated rest (CON) was performed. Mean skin temperature (T<sub>skin</sub>) decreased by 4.3 ± 1.08°C (<em>p</em> &lt; 0.001) immediately after PBC, while CWI induced a reduction of 2.5 ± 0.21°C (<em>p</em> &lt; 0.01). Furthermore, PBC and CWI consistently reduced T<sub>skin</sub> for 15 and 33 min, respectively (<em>p</em> &lt; 0.05). During the 2<sup>nd</sup> bout, core temperature (T<sub>core</sub>) was significantly lower in PBC compared to CON (<em>p</em> &lt; 0.05). Heart rate (HR) was significantly lower in CWI compared to CON and PBC during the intervention period. Thermal sensation (TS) was significantly greater in PBC compared to CON and CWI (<em>p</em> &lt; 0.05). Compared to the 1<sup>st</sup> bout, PBC alleviated the declines in T-test (<em>p</em> &lt; 0.05) and 20M-ST (<em>p</em> &lt; 0.05), while CWI alleviated the decreases in T-test (<em>p</em> &lt; 0.05) and YY-T (<em>p</em> &lt; 0.05), concurrently significantly enhancing 20M-ST (<em>p</em> &lt; 0.05). 20M-ST and YY-T was greater from PBC (<em>p</em> &lt; 0.05) and CWI (<em>p</em> &lt; 0.05) compared with CON in 2<sup>nd</sup> bout. Additionally, the T-test in CWI was significantly greater than CON (<em>p</em> &lt; 0.05). These results indicate that both PBC and CWI, performed between two exercise bouts, have the potential to improve thermoregulatory strain, reduce thermal perceptual load, and thereby attenuate the subsequent decline in exercise performance.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S030645652400144X/pdfft?md5=7d4bc1eeb98b361baa687ad33f4a57b6&pid=1-s2.0-S030645652400144X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141878959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of seven days heat stress on feed and water intake, milk characteristics, blood parameters, physiological indicators, and gene expression in Holstein dairy cows 七天热应激对荷斯坦奶牛采食量和饮水量、牛奶特性、血液参数、生理指标和基因表达的影响。
IF 2.9 2区 生物学
Journal of thermal biology Pub Date : 2024-07-01 DOI: 10.1016/j.jtherbio.2024.103929
{"title":"Effect of seven days heat stress on feed and water intake, milk characteristics, blood parameters, physiological indicators, and gene expression in Holstein dairy cows","authors":"","doi":"10.1016/j.jtherbio.2024.103929","DOIUrl":"10.1016/j.jtherbio.2024.103929","url":null,"abstract":"<div><p>This study examined the effects of 7 days of heat stress on eight early lactating Holstein cows in climate-controlled chambers. The early lactating Holstein cows (42 ± 2 days in milk, 29.27 ± 0.38 kg/day milk yield, 1.21 ± 0.05 parity) were subjected to two 14-day periods, each consisting of 7 days of adaptation and 7 days of heat stress. Conditions were set to 22 °C and 50% humidity during adaptation, followed by heat stress periods with low-temperature, low-humidity (LTLH, 71 THI) and high-temperature, high-humidity (HTHH, 86 THI) treatments. Data from the last 7 days were analyzed using a mixed procedure in SAS. In the study, the HTHH group displayed marked physiological and biochemical changes on 14 days of heat stress exposure compared to the LTLH group. Firstly, the HTHH group's dry matter intake decreased by approximately 12% while their water intake increased by about 23%. Secondly, both milk yield and milk protein production in the HTHH group decreased by 10% and 20%, respectively. Thirdly, there was a reduction in white blood cells, hemoglobin, mean corpuscular hemoglobin, and platelets in the HTHH group, with concurrent increases in glucose, non-esterified fatty acids, and albumin concentrations. Additionally, the HTHH group exhibited elevated plasma concentrations of cortisol and haptoglobin. Moreover, the gene expression of heat shock protein 70 and heat shock protein 90 was significantly upregulated in the HTHH group's peripheral blood mononuclear cells. Lastly, key physiological indicators such as rectal temperature, heart rate, and skin temperature showed substantial elevations in the HTHH group. Considering the enormous negative effects observed in the analyzed blood metabolites, milk yield and compositions, and heat shock protein gene expression, early lactating Holstein cows were found to be more vulnerable to HTHH than LTLH over a 7 days exposure to heat stress.</p></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141897716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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